|Publication number||US5167427 A|
|Application number||US 07/688,455|
|Publication date||Dec 1, 1992|
|Filing date||Apr 22, 1991|
|Priority date||May 24, 1990|
|Also published as||CA2041425A1, DE4115873A1, DE4115873C2|
|Publication number||07688455, 688455, US 5167427 A, US 5167427A, US-A-5167427, US5167427 A, US5167427A|
|Original Assignee||Takata Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (37), Classifications (8), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an air bag device adapted to develop an air bag at a crash or the like of a vehicle for protecting an occupant, and particularly to an improved air bag device which allows easy assembling of a module cover covering an air bag in an assembly process.
In an air bag device, a folded air bag is attached to a mounting plate called as a "retainer", and is covered with a module cover. The module cover is similarly attached to the retainer, and is provided with a tear line (weak linear portion) at which tear starts when the air bag develops.
Further, an inflator is attached directly or through an appropriate mounting member to the retainer. The inflator is adapted to discharge a gas for rapidly developing the air bag at the crash or the like of the vehicle.
Such an air bag in the prior art will be described below with reference to FIGS. 7 and 8.
In FIG. 7, a retainer 10 has a flat plate portion 14 to which an air bag 12 is attached, and a module cover mounting which is formed of an erected piece 16 projected oppositely to an occupant (i.e., oppositely to a mounting side of the air bag 12) from an edge of the flat plate portion 14. The air bag 12 is in a folded condition and is covered with a module cover 18. The module cover 18 has a leg 18a at a proximal side thereof, which is fixed to the above erected piece 16 by rivets 20. A numeral 22 indicates an inflator, which has an upper portion projected through an opening 24 formed in the flat plate portion 14 into the air bag 12, and is fixed to the retainer 10. A numeral 26 indicates an air bag mounting member called as a ring, which cooperates with an edge of the opening 24 in the flat plate portion 14 to pinch an open edge of the air bag 12, so as to fix the air bag 12 to the retainer 10. A numeral 28 indicates a tear line provided in the above module cover 18.
In the air bag device thus constructed, when the inflator 22 is activated due to the crash or the like of the vehicle, a large amount of gas is rapidly injected from the inflator 22 to start the development of the air bag 12. In accordance with the inflation of the air bag 12, the module cover 18 tears along the tear line 28, as shown in FIG. 8, and thus, the air bag 12 rapidly develops at the interior of the vehicle to protect an occupant.
In a manufacturing process of the prior art air bag device, the air bag 12 is fixed to the retainer 10, and then is folded to have a small volume so that the folded air bag 12 is laid on the retainer 10. Then, the module cover 18 is assembled from an upper side to accommodate the air bag 12. The module cover 18 is pushed into a position in which the leg 18a of the module cover 18 overlaps the erected piece 16 of the retainer 10. In this condition, a reinforcing member 21 is laid thereon and the module cover 18 is fixed thereto by the rivets 20.
As described above, in this assembling process, after the module cover 18 is put or assembled over the air bag 12, these are sent to a riveting step in which the leg 18a is fixed by the rivets 20 while maintaining the air bag 12 in the compacted condition. However, if one leaves his or her hold of the module cover 18, the module cover 18 is floated and spaced from the retainer 10 due to a resiliency of the compacted air bag 12. Therefore, in the riveting step after the putting and covering step of the module cover, an operation for pushing the module cover 18 to cover the retainer 10 is required again, which causes a problem of low operation efficiency.
Further, there are such problems that the module cover may be dislocated and/or a whole volume becomes large during transferring from the folding step of the air bag to the riveting step.
It is an object of the invention to provide an air bag device allowing an extremely easy assembling.
It is another object of the invention to provide an air bag device having a high coupling strength between a module cover and a retainer.
An air bag device of the invention, in which an air bag is attached to a retainer to which a module cover for covering the air bag is fixed, is characterized in that the module cover is provided with an engagement portion for the retainer.
In the air bag device thus constructed of the invention, when the module cover is put to cover the air bag after folding, the engagement portion of the module cover engages with the retainer, so that the module cover will not be dislocated from the retainer even if one releases his or her hold of the module cover.
FIG. 1 is a longitudinal section illustrating an embodiment of the invention;
FIGS. 2A, 2B, 2C and 2D are views for illustrating an assembling process thereof;
FIGS. 3A, 3B, 3C and 3D are views for illustrating an assembling process of another embodiment;
FIG. 4 is a perspective view of a retainer;
FIG. 5 is a fragmentary cross section of a still another embodiment;
FIGS. 6A, 6B, 6C and 6D are views for illustrating an assembling process thereof; and
FIGS. 7 and 8 are cross sections illustrating a prior art.
Embodiments will be described below with reference to the drawings.
FIG. 1 is a longitudinal section of an air bag device according to an embodiment of the present invention, and FIGS. 2A, 2B, 2C and 2D are views for illustrating an assembling process thereof. In this embodiment, a module cover 18 has a leg 18a which is provided at its end with a hook 30 forming an engagement portion. This hook 30 protrudes toward an interior of the module cover 18, and is engageable with an end surface of an erected piece 16 of a retainer 10.
As shown in FIGS. 2A-2D, when the module cover 18 is put over the retainer 10, the leg 18a elastically deforms outward, as shown in FIG. 2C, and slides along on the erected piece 16. The hook 30 ultimately engages with the end of the erected piece 16, as shown in FIG. 2D and FIG. 1.
After the hook 30 engages with the end of the erected piece 16, the module cover 18 will not be dislocated from the retainer 10 even if the folded air bag 12 biases the module cover 18 upward. Therefore, in a folding step of the air bag 12, the module cover 18 which is put over the retainer 10 it is not dislocated from the retainer 10 even if the module cover 18 is not yet fixed by the rivets 20. Consequently, dislocation of the module cover 18 can be completely prevented during transfer thereof from the folding step of the air bag 12 to the riveting step, and further, the whole air bag device is transferred to the riveting step while maintaining compact configurations. In the riveting step, it is not necessary to push the module cover 18 again, and it can be set in a riveting apparatus for fastening the rivets 20 as it is, so that the riveting efficiency can be extremely increased.
FIGS. 3A, 3B, 3C and 3D are views for illustrating an assembling process of an air bag device according to another embodiment of the invention, and FIG. 4 is a perspective view of a retainer used in this embodiment. In this embodiment, the retainer 10 is provided with partially cut and bent tongues 31. The tongues 31 have edges, which are located at a side of a flat plate portion 14 of the retainer 10 and are continuous to the retainer 10, and have free ends, which are located at a side of the erected piece 16. The module cover 18 is provided with openings 36 having sizes for receiving these tongues 31, respectively, and the openings 36 function as engagement portions. In FIG. 4, numerals 32 indicate rivet holes provided in the erected piece 16, and numerals 34 indicate rivet holes in the flat plate portion 14 for fixing an inflator 22.
Also in this embodiment, when the module cover 18 is moved to cover the retainer 10, the leg 18a elastically deforms outward along the outer surface of the erected piece 16, and ultimately, as shown in FIG. 3D, the tongues 31 move into the openings 36 to form an engaged condition. Owing to the engagement of the tongues 31 and the openings 36, the module cover 18 will not be dislocated from the retainer 10 by the resiliency applied from the air bag 12.
FIG. 5 and FIGS. 6A, 6B, 6C and 6D are views for illustrating an assembling process of a still another embodiment of the invention. Specifically, FIG. 5 is a perspective sectional view of engaged portions of the retainer and the hook after the assembly, and FIGS. 6A, 6B, 6C and 6D are views illustrating assembling steps, respectively.
In this embodiment, the module cover 18 is provided at the end of the leg 18a with the hook 30, and this hook 30 is provided with openings 38. The retainer 10 is provided at the end of the erected piece 16 with projections 40 to be located in the openings 38.
Also in this embodiment, when the module cover 18 is moved to cover the retainer 10, the leg 18a elastically deforms outward along the outer surface of the erected piece 16 of the retainer 10, as shown in FIG. 6C, and ultimately, the hook 30 engages with the end of the erected piece 16, as shown in FIG. 6D. In this operation, the projections 40 are located in the opening 38 to engage the module cover 18 extremely tightly with the retainer.
Also in this embodiment, even if the air bag 12 applies the resiliency to the module cover 18 prior to the riveting, the module cover 18 is not dislocated from the retainer 10. Particularly, in this embodiment, since the projections 40 and the openings 38 are engaged with each other, dislocation of the module cover 18 from the retainer 10 can be reliably prevented even if a relatively large resiliency is applied from the air bag 12 to the module cover 18 or an external force is applied thereto. Further, owing to the engagement of the projections 40 and the openings 38, constant positioning of the module cover 18 and the retainer 10 can be achieved, which extremely facilitates the riveting work to be performed after coinciding of the rivet holes of the retainer 10 and the module cover 18.
According to the air bag device of the invention, as described hereinabove, since the module cover is temporarily fixed to the retainer in the assembling process thereof, the assembling work of the air bag device can be extremely facilitated, and thus the assembling work efficiency can be remarkably improved. Further, the engagement of the engagement portion with the retainer increases coupling strength between the module cover and the retainer in the tearing operation of the module cover when the air bag device is activated.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3532360 *||Jul 22, 1968||Oct 6, 1970||Chrysler Corp||Gas generating apparatus for vehicle safety device|
|US3588142 *||Sep 9, 1968||Jun 28, 1971||John F Gorman||Vehicle safety device|
|US4877264 *||Dec 27, 1988||Oct 31, 1989||Talley Automotive Products, Inc.||Aspirating/venting air bag module assembly|
|US5074584 *||Jun 20, 1990||Dec 24, 1991||Trw Vehicle Safety Systems Inc.||Air bag fastener|
|DE3545028A1 *||Dec 19, 1985||Jul 2, 1987||Audi Ag||Covering cap|
|DE3604843A1 *||Feb 15, 1986||Aug 27, 1987||Daimler Benz Ag||Gas generator|
|DE8904999U1 *||Apr 20, 1989||Jul 20, 1989||Takata Corp., Tokio/Tokyo, Jp||Title not available|
|GB1601127A *||Title not available|
|GB2192841A *||Title not available|
|JPH036847A *||Title not available|
|JPS649146A *||Title not available|
|JPS6433267A *||Title not available|
|JPS6460756A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5275432 *||Oct 30, 1992||Jan 4, 1994||Alliedsignal Inc.||Air bag deployment door with snap fit|
|US5297813 *||Nov 2, 1992||Mar 29, 1994||Takata Corporation||Air bag device having a connecting arrangement to facilitate assembly|
|US5303951 *||Oct 30, 1992||Apr 19, 1994||Allied-Signal Inc.||Air bag assembly with housing and fastenerless deployment door|
|US5312129 *||Mar 25, 1992||May 17, 1994||Nsk Ltd.||Connection structure for air bag cover and housing|
|US5316333 *||Nov 16, 1992||May 31, 1994||Takata Corporation||Air bag cover mounting having engagement portions to facilitate attachment|
|US5338060 *||Jun 18, 1993||Aug 16, 1994||Morton International, Inc.||Energy dissipation features in air bag closures|
|US5342090 *||Jul 8, 1993||Aug 30, 1994||Alliedsignal Inc.||Passenger air bag module with means for retaining an air bag deployment door to a housing|
|US5348339 *||Dec 23, 1992||Sep 20, 1994||Alliedsignal Inc.||Air bag module with cover|
|US5354093 *||Apr 5, 1993||Oct 11, 1994||General Motors Corporation||Air bag module having integral cover attachment|
|US5425550 *||Feb 4, 1994||Jun 20, 1995||Morton International, Inc.||Unperforated slide-in passenger side airbag module cushion cover|
|US5427407 *||Sep 26, 1994||Jun 27, 1995||Nsk Ltd.||Air bag system|
|US5435593 *||Nov 17, 1993||Jul 25, 1995||Toyoda Gosei Co., Ltd.||Air bag apparatus|
|US5435596 *||May 9, 1994||Jul 25, 1995||Morton International, Inc.||Passenger airbag module deployment door attachment system|
|US5445409 *||Oct 17, 1994||Aug 29, 1995||General Motors Corporation||Passenger airbag snap-on deployment door|
|US5474323 *||Jun 8, 1994||Dec 12, 1995||Takata, Inc.||Passenger air bag module with snap-attachment deployment cover|
|US5496057 *||Mar 31, 1995||Mar 5, 1996||General Motors Corporation||Air bag module cover retainer|
|US5505483 *||Apr 26, 1994||Apr 9, 1996||Nippondenso Co., Ltd.||Airbag safety module for vehicle|
|US5520411 *||Mar 23, 1995||May 28, 1996||Morton International, Inc.||Cover mounting for an airbag assembly|
|US5524922 *||Mar 8, 1994||Jun 11, 1996||Morton International, Inc.||Energy dissipation features in air bag clousures|
|US5527064 *||Nov 29, 1994||Jun 18, 1996||Honda Giken Kogyo Kabushiki Kaisha||Inflatable air bag system|
|US5580082 *||Jun 7, 1995||Dec 3, 1996||Toyoda Gosei Co., Ltd.||Steering wheel pad attachment structure|
|US5588669 *||Apr 26, 1995||Dec 31, 1996||Morton International, Inc.||Cover attachment for an air bag module|
|US5658008 *||Jul 13, 1995||Aug 19, 1997||Takata (Europe) Vehicle Safety Technology Gmbh||Airbag arrangement|
|US5704635 *||Feb 23, 1996||Jan 6, 1998||Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho||Air bag cover holding structure|
|US5709402 *||Jul 29, 1996||Jan 20, 1998||Morton International, Inc.||Attachment fingers for airbag module cover|
|US5725240 *||Sep 27, 1995||Mar 10, 1998||Nsk Ltd.||Air bag module|
|US5762359 *||Oct 2, 1996||Jun 9, 1998||General Motors Corporation||Air bag module and steering wheel assembly|
|US5762361 *||Mar 31, 1997||Jun 9, 1998||Takata (Europe) Safety Technology Gmbh||Airbag arrangement|
|US6029992 *||Nov 24, 1997||Feb 29, 2000||General Motors Corporation||Air bag module and steering wheel assembly|
|US6409208 *||Sep 29, 2000||Jun 25, 2002||Trw Automotive Safety Systems Gmbh & Co. Kg||Detent connection|
|US7234725 *||May 28, 2004||Jun 26, 2007||Autoliv Asp, Inc.||Driver side airbag module assembly|
|US20050263988 *||May 28, 2004||Dec 1, 2005||Richard Welford||Driver side airbag module assembly|
|CN1056570C *||Dec 25, 1995||Sep 20, 2000||丰田合成株式会社||Air bag device|
|DE4425495A1 *||Jul 19, 1994||Jan 25, 1996||Takata Europ Gmbh||Airbag unit for vehicle|
|DE19535980A1 *||Sep 27, 1995||Apr 4, 1996||Nsk Ltd||Airbag module fitted in vehicle|
|EP0983170A1 *||May 12, 1998||Mar 8, 2000||Breed Automotive Technology, Inc.||Fastenerless driver air bag cover and easy to assemble air bag module assembly|
|EP0983170A4 *||May 12, 1998||Jun 1, 2005||Breed Automotive Tech||Fastenerless driver air bag cover and easy to assemble air bag module assembly|
|U.S. Classification||280/728.3, 403/363|
|International Classification||B60R21/20, B60R21/217, B60R21/215|
|Cooperative Classification||B60R21/217, Y10T403/7043|
|Apr 22, 1991||AS||Assignment|
Owner name: TAKATA CORPORATION, 4-30, ROPPONGI 1-CHOME, MINATO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BABA, YOSHIYUKI;REEL/FRAME:005685/0473
Effective date: 19910403
|May 6, 1996||FPAY||Fee payment|
Year of fee payment: 4
|May 15, 2000||FPAY||Fee payment|
Year of fee payment: 8
|May 4, 2004||FPAY||Fee payment|
Year of fee payment: 12